Combined high RF power and pellet fuelling experiments in Tore Supra
A new pellet injector designed and built by PELIN laboratory was recently implemented on Tore Supra. It allows to inject a continuous stream of deuterium pellets at high frequency with a very good reliability. The pellets can be lauched through one of the four guide tubes allowing injection from the High Field Side of the torus, vertically and from the Low Field Side. When pellets are injected during LHCD, suprathermal electrons produced by the wave strongly increase the ablation rate and thus reduce dramatically the pellet penetration depth. The pellet � LHCD scenario developed on Tore Supra is based on a simultaneous feedback on the density and a pellet synchronised notching of the LH power to avoid this suprathermal electrons ablation. Such a scenario allowed to obtain very long pellet fuelled discharges in Tore Supra. Data from X-mode reflectometers and a FIR interferometer are combined to give density profiles with a time resolution of 1 ms. Standard CCD cameras and fast H alpha measurements are used to measure the pellet penetration depth and the ablation rate assuming its proportionality with H alpha emission.
Bibliographic Reference: An oral paper given at: 32nd EPS Conference on Controlled Fusion and Plasma Physics Organised by: Asociación EURATOM-CIEMAT para Fusión Held at: Congress Palace of Tarragona, Tarragona (ES)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, FranceL%Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: firstname.lastname@example.org
Record Number: 200518281 / Last updated on: 2005-07-26
Original language: en
Available languages: en